Hitting every. single. fucking. dead end on my unstoppable march to introduce a nice feature.

I'm trying to embed interactive svg maps in a Wordpress page in such a way that the areas can be edited intuitively using Inkscape and all the page does is inline the xml markup, but also there's a JPG background embedded in the picture which Wordpress finds too big for markup (unsurprisingly) but which is a pain in the ass to reference externally.